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ceph: check zero length in ceph_sync_read()

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Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
This commit is contained in:
Yan, Zheng 2014-07-21 10:15:48 +08:00
parent 51da8e8c6f
commit d0d0db2268
1 changed files with 3 additions and 0 deletions
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3
fs/ceph/file.c
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@ -423,6 +423,9 @@ static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *i,
dout("sync_read on file %p %llu~%u %s\n", file, off,
(unsigned)len,
(file->f_flags & O_DIRECT) ? "O_DIRECT" : "");
if (!len)
return 0;
/*
* flush any page cache pages in this range. this
* will make concurrent normal and sync io slow,